I have a difficult problem: I always get a Nullpointer exception on my webpace,

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Asked: June 13, 20262026-06-13T07:39:59+00:00 2026-06-13T07:39:59+00:00

I have a difficult problem: I always get a Nullpointer exception on my webpace,

0

I have a difficult problem: I always get a Nullpointer exception on my webpace, when I
rapidly click on the same link. Or when I reload the page rapidly.
This is the error I get:

java.lang.NullPointerException
    com.ibm.xsp.webapp.FacesServlet.acquireSyncToken(FacesServlet.java:285)
    com.ibm.xsp.webapp.FacesServletEx.serviceView(FacesServletEx.java:161)
    com.ibm.xsp.webapp.FacesServlet.service(FacesServlet.java:160)
    com.ibm.xsp.webapp.FacesServletEx.service(FacesServletEx.java:138)
    com.ibm.xsp.webapp.DesignerFacesServlet.service(DesignerFacesServlet.java:103)
    com.ibm.designer.runtime.domino.adapter.ComponentModule.invokeServlet(ComponentModule.java:576)
    com.ibm.domino.xsp.module.nsf.NSFComponentModule.invokeServlet(NSFComponentModule.java:1281)
    com.ibm.designer.runtime.domino.adapter.ComponentModule$AdapterInvoker.invokeServlet(ComponentModule.java:847)
    com.ibm.designer.runtime.domino.adapter.ComponentModule$ServletInvoker.doService(ComponentModule.java:796)
    com.ibm.designer.runtime.domino.adapter.ComponentModule.doService(ComponentModule.java:565)
    com.ibm.domino.xsp.module.nsf.NSFComponentModule.doService(NSFComponentModule.java:1265)
    com.ibm.domino.xsp.module.nsf.NSFService.doServiceInternal(NSFService.java:653)
    com.ibm.domino.xsp.module.nsf.NSFService.doService(NSFService.java:476)
    com.ibm.designer.runtime.domino.adapter.LCDEnvironment.doService(LCDEnvironment.java:341)
    com.ibm.designer.runtime.domino.adapter.LCDEnvironment.service(LCDEnvironment.java:297)
    com.ibm.domino.xsp.bridge.http.engine.XspCmdManager.service(XspCmdManager.java:272)

Question: Can someone explain in detail what this acquireSyncToken does? Maybe then I can find the bug…

In my XPages I use

sessionScope.get(key) // same with applicationScope
sessionScope.put(key, value) // same with applicationScope

a LOT 😉
I tried very much, e.g. to wrap my lookups within

synchronize(applicationScope){
// lookups and so on...
}

and stuff like that, but that only made it worse, so I removed the synchronize-stuff…

Environment:

Domino Server 8.5.3 FP1
XPages
testing on modern Browsers like FF, Chrome
MacOS / Win7

Architecture:
I have one BIG xPage, where I basically add some CustomControls and due to the current URL embed another XPage.
Inside the CustomControls and XPages I have more Custom Controls and I added some Views as Datasources and did the wildest things with “repeat controls” and SSJS inside Computed Fields.
The heavy-weight DB-Lookups are cached in the applicationScope.

For more Info, please ask!
Thanks in advance!